14-6
MSM66591/ML66592 User's Manual
Chapter 14 Baud Rate Generator Functions
14.3 Configuration of SCI1 Timer (S1TM)
The SCI1 timer (S1TM) consists of an 8-bit SCI1 timer counter, an 8-bit SCI1 timer
register that stores the reload values of the SCI1 timer counter, and a control register
(S1CON) that specifies S1TM operations.
[1]
SCI1 Timer Counter (low-order 8 bits of 16-bit register S1TM)
The SCI1 timer counter is an 8-bit counter. When S1TM overflows, an interrupt request
is generated, and the content of the 8-bit SCI1 timer register is loaded to SCI1 timer
counter. The count clock of S1TM is selected by the high-order 3 bits (bits 5–7) of the
8-bit SCI1 timer control register (S1CON).
[2]
SCI1 Timer Register (high-order 8 bits of 16-bit register S1TM)
The SCI1 timer register is an 8-bit register. The content of the register is loaded to the
SCI1 timer counter when the counter overflows.
The SCI1 timer counter and SCI1 timer register are accessible only as a16-bit S1TM
which uses the SCI1 timer counter as its low-order 8 bits and the SCI1 timer register as
its high-order 8 bits.
At reset (when the
RES
signal is input, the BRK instruction is executed, the watchdog
timer is overflown, or an operation code trap is generated), S1TM becomes 0000H, and
the count operation stops.
[3]
SCI1 Timer Control Register (S1CON)
S1CON is an 8-bit register. The high-order 4 bits (bits 4–7) select the count clock of
S1TM, and control the start/stop of the count operation. The low-order 2 bits (bits 2, 3)
perform interrupt related controls. The least significant bit (bit 0) specifies the mode of
S1TM.
At reset (when the
RES
signal is input, the BRK instruction is executed, the watchdog
timer is overflown, or an operation code trap is generated), S1CON becomes 02H, a
CLK is selected as the count clock of S1TM, the auto-reload timer mode is selected,
and operation stops.
Figure 14-3 shows the configuration of S1CON.
<Description of Each Bit>
• S1MOD (bit 0)
This bit specifies the operation mode of S1TM. If this bit is "0", S1TM operates in
auto reload mode. If "1", S1TM operates in SCI1 baud rate generator mode.
• QSTM1 (bit 2)
This bit becomes "1" if an SCI1 timer counter overflow is generated. Since this bit
does not become "0" automatically after an interrupt process is executed, it is
necessary to set to "0" by the program.
• ESTM1 (bit 3)
This bit enables/disables an interrupt request generation by an SCI1 timer counter
overflow. If this bit is "1", generation is enabled, and if "0", generation is disabled.
Содержание MSM66591
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